From: Catalin Marinas <catalin.marinas@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-mm@kvack.org, linux-arch@vger.kernel.org,
Will Deacon <will@kernel.org>,
Dave P Martin <Dave.Martin@arm.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Szabolcs Nagy <szabolcs.nagy@arm.com>,
Kevin Brodsky <kevin.brodsky@arm.com>,
Andrey Konovalov <andreyknvl@google.com>,
Peter Collingbourne <pcc@google.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH v7 16/29] arm64: mte: Validate the PROT_MTE request via arch_validate_flags()
Date: Wed, 15 Jul 2020 18:08:31 +0100 [thread overview]
Message-ID: <20200715170844.30064-17-catalin.marinas@arm.com> (raw)
In-Reply-To: <20200715170844.30064-1-catalin.marinas@arm.com>
Make use of the newly introduced arch_validate_flags() hook to
sanity-check the PROT_MTE request passed to mmap() and mprotect(). If
the mapping does not support MTE, these syscalls will return -EINVAL.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
---
arch/arm64/include/asm/mman.h | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/mman.h b/arch/arm64/include/asm/mman.h
index b01051be7750..e3e28f7daf62 100644
--- a/arch/arm64/include/asm/mman.h
+++ b/arch/arm64/include/asm/mman.h
@@ -49,8 +49,10 @@ static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
* register (1) as VM_MTE in the vma->vm_flags and (2) as
* VM_MTE_ALLOWED. Note that the latter can only be set during the
* mmap() call since mprotect() does not accept MAP_* flags.
+ * Checking for VM_MTE only is sufficient since arch_validate_flags()
+ * does not permit (VM_MTE & !VM_MTE_ALLOWED).
*/
- if ((vm_flags & VM_MTE) && (vm_flags & VM_MTE_ALLOWED))
+ if (vm_flags & VM_MTE)
prot |= PTE_ATTRINDX(MT_NORMAL_TAGGED);
return __pgprot(prot);
@@ -72,4 +74,14 @@ static inline bool arch_validate_prot(unsigned long prot,
}
#define arch_validate_prot(prot, addr) arch_validate_prot(prot, addr)
+static inline bool arch_validate_flags(unsigned long vm_flags)
+{
+ if (!system_supports_mte())
+ return true;
+
+ /* only allow VM_MTE if VM_MTE_ALLOWED has been set previously */
+ return !(vm_flags & VM_MTE) || (vm_flags & VM_MTE_ALLOWED);
+}
+#define arch_validate_flags(vm_flags) arch_validate_flags(vm_flags)
+
#endif /* ! __ASM_MMAN_H__ */
next prev parent reply other threads:[~2020-07-15 17:09 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-15 17:08 [PATCH v7 00/26] arm64: Memory Tagging Extension user-space support Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 01/29] arm64: mte: system register definitions Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 02/29] arm64: mte: CPU feature detection and initial sysreg configuration Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 03/29] arm64: mte: Use Normal Tagged attributes for the linear map Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 04/29] arm64: mte: Add specific SIGSEGV codes Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 05/29] arm64: mte: Handle synchronous and asynchronous tag check faults Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 06/29] mm: Add PG_arch_2 page flag Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 07/29] mm: Preserve the PG_arch_2 flag in __split_huge_page_tail() Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 08/29] arm64: mte: Clear the tags when a page is mapped in user-space with PROT_MTE Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 09/29] arm64: mte: Tags-aware copy_{user_,}highpage() implementations Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 10/29] arm64: Avoid unnecessary clear_user_page() indirection Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 11/29] arm64: mte: Tags-aware aware memcmp_pages() implementation Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 12/29] arm64: mte: Handle the MAIR_EL1 changes for late CPU bring-up Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 13/29] mm: Introduce arch_calc_vm_flag_bits() Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 14/29] arm64: mte: Add PROT_MTE support to mmap() and mprotect() Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 15/29] mm: Introduce arch_validate_flags() Catalin Marinas
2020-07-15 17:08 ` Catalin Marinas [this message]
2020-07-15 17:08 ` [PATCH v7 17/29] mm: Allow arm64 mmap(PROT_MTE) on RAM-based files Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 18/29] arm64: mte: Allow user control of the tag check mode via prctl() Catalin Marinas
2020-07-20 15:30 ` Kevin Brodsky
2020-07-20 17:00 ` Dave Martin
2020-07-22 10:28 ` Catalin Marinas
2020-07-23 19:33 ` Kevin Brodsky
2020-07-22 11:09 ` Catalin Marinas
2020-08-04 19:34 ` Kevin Brodsky
2020-08-05 9:24 ` Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 19/29] arm64: mte: Allow user control of the generated random tags " Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 20/29] arm64: mte: Restore the GCR_EL1 register after a suspend Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 21/29] arm64: mte: Allow {set,get}_tagged_addr_ctrl() on non-current tasks Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 22/29] arm64: mte: ptrace: Add PTRACE_{PEEK,POKE}MTETAGS support Catalin Marinas
2020-08-13 14:01 ` Luis Machado
2020-08-22 10:56 ` Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 23/29] arm64: mte: ptrace: Add NT_ARM_TAGGED_ADDR_CTRL regset Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 24/29] fs: Handle intra-page faults in copy_mount_options() Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 25/29] mm: Add arch hooks for saving/restoring tags Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 26/29] arm64: mte: Enable swap of tagged pages Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 27/29] arm64: mte: Save tags when hibernating Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 28/29] arm64: mte: Kconfig entry Catalin Marinas
2020-07-15 17:08 ` [PATCH v7 29/29] arm64: mte: Add Memory Tagging Extension documentation Catalin Marinas
2020-07-27 16:36 ` Szabolcs Nagy
2020-07-28 11:08 ` Dave Martin
2020-07-28 14:53 ` Szabolcs Nagy
2020-07-28 19:59 ` Catalin Marinas
2020-08-03 12:43 ` Szabolcs Nagy
2020-08-07 15:19 ` Catalin Marinas
2020-08-10 14:13 ` Szabolcs Nagy
2020-08-11 17:20 ` Catalin Marinas
2020-08-12 12:45 ` Szabolcs Nagy
2020-08-19 9:54 ` Catalin Marinas
2020-08-20 16:43 ` Szabolcs Nagy
2020-08-20 17:27 ` Paul Eggert
2020-08-22 11:31 ` Catalin Marinas
2020-08-22 11:28 ` Catalin Marinas
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200715170844.30064-17-catalin.marinas@arm.com \
--to=catalin.marinas@arm.com \
--cc=Dave.Martin@arm.com \
--cc=akpm@linux-foundation.org \
--cc=andreyknvl@google.com \
--cc=kevin.brodsky@arm.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-mm@kvack.org \
--cc=pcc@google.com \
--cc=szabolcs.nagy@arm.com \
--cc=vincenzo.frascino@arm.com \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).